import java.io.*;
import java.net.*;

class TCPServer {
  public static void main(String argv[]) throws Exception {
    String clientSentence;
    String capitalizedSentence;
    ServerSocket welcomeSocket = new ServerSocket(6789);
    while (true) {
      Socket connectionSocket = welcomeSocket.accept();
      BufferedReader inFromClient =
          new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
      DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
      clientSentence = inFromClient.readLine();
      capitalizedSentence = clientSentence.toUpperCase();
      outToClient.writeBytes(capitalizedSentence);
    }
  }
}